Tire-valve.



W. C. FAIRES.

-TIRE VALVE.

APPLICATION map SEPT- 21. 191 1.

1,269,694. 4 Patented June 18, 1918.

Jag/61136; W C. m5

Amn r;

UNITED STATES PATENT OFFICE.

WILLIAM CURTIS FAIRES, 0F MOUNT GILEAD, OHIO.

TIRE-VALVE.

Application filed September 27, 1917.

To all whom it may concern:

Be it known that I, WILLIAM CURTIs FAIRES, a citizen of the United States, residing at Mount Gilead, in the county of Morrow and State of Ohio, have invented new and useful Improvements in Tiro- Valves, of which the following is a specification.

This invention relates to valves employed in connection with the inner tube of pneu matic tires, and its object is to providean inflation valve which has nove and improved means for relieving the tire of any excess internal pressure which may develop from overheating or other causes.

The object stated is attained by means of a combination and arrangement of parts to be hereinafter described and claimed and in order that the same may be better understood, reference is had to the accompanying drawing forming a part of thls specification.

In the drawing,

Figure 1 is an elevation of the device, and

Fig. 2 is a longitudinal section thereof.

Referring specifically to the drawing, 5 denotes the usual stem of a tire inflating valve, said stem having at one end the ordinary means whereby it is attached to the tire tube. The other end of the stem is closed by a removable screw plug 6, with a washer 7 interposed between said parts to make an air tight joint.

The plug 6 has a central longitudmal passageway through which extends loosely the stem 8 of an ordinary inflating valve 9 provided with the usual spring 10 for holding the same seated in closing position.

The valve stem 5 also contains a relief valve for permitting the escape of any excessive pressure which may develo 1n the tire tube from any cause. This Va ve comprises a head 11 held normally in engagement with a seat 12 in the stem 5 by a coiled spring 13. The valve head 11 has a guide stem 14 which slidably enters a central longitudinal passageway in a screw plug 15 mounted in the stem 5, the latter being internally threaded to hold said plug.

The valve head 11 and its stem 14 are Specification of Letters Patent.

Patented June 18, 1918.

Serial No. 193,489.

longitudinally apertured to provide a pas sageway and to accommodate the valve stem 8 the latter having a sufiiciently loose fit therein to allow the air to pass. The spring 13 is coiled around the stem 14 between the valve head 10 and the plug 15. i

The valve 9 seats on the inner side of the valve head 11 and when seated it prevents the outward flow of air through the passage way in the valve head and its stem 14.. Upon mnnccting an air supply to the plug 6, the air [lows through the passageway therein and also through the passageway in the stem I14 and the valve head 11 and. unseats the valve 9, and. then flows into the tire tube. The valve 9 therefore functions in the same manner as any ordinary inflation Valve.

The valve head 11 is exposed to the pres sure in the tire tube, and hence when the pressure becomes great enough to unseat the valve head, the excess pressure is free to escape by passing around the valve head and through the passageways in the plugs 15 and 6. The tension of the spring 13 may be regulated by the plug 15, and hence the relief valve can be set to open at any predetermined maximum air pressure. It will be understood of course that the tension of the spring 10 is less than that of the spring 13.

The structure of the device is simple, and by reason of the few uncomplicated parts, the operation is reliable.

In order to facilitate escape of excess air when the usual valve stem cap is applied to the stem 5, the latter is provided on the outside with a series ofgrooves 16. These grooves do not run vertically in one strai ht line from the top to the bottom of the va ve stem, as that would permit of entrance of dust and dirt, but as shown in Fig. l of the drawing, they are offset relative to each \other. The second groove starts at the inner end of the first groove, and the third groove starts at the inner end of the second groove.

I claim A tire valve comprising a hollow externally screw-threaded stem having external longitudinal grooves arranged offset relative tioned passageway, and a spring-seated to each other, and said stem having an invalve engageable with the fil'st-n'ientioned ternal valve seat and a passageway there valve over the passageway thereof.

from to the outside, a spring-seated valve In testimony whereof I nlfiX my signature. 10 5 engaging said seat and having a passage- Way in communication with the first-men WILLIAM CURTIS FAIRES.

Ooplen of thin patent may be obtained for five cents each, by addressing the "Commissioner of Pate-nil,

wlfllllml, D. 0. 

